Chair back or similar article



FIG. 1 is a front elevational view of a chair back or similar article showing my new design;

FIG. 2 is a right side elevational view;

FIG. 3 is a top plan view;

FIG. 4 is a rear elevational view;

FIG. 5 is a bottom plan view; and

FIG. 6 is a front and left side perspective view. 

The ornamental design for a chair back or similar article, as shown. 